Monitoring and control system equipment Division hierarchy analyses

In this medium called the monitoring system used in hierarchy consisting of the device, in computer networks use topology also in the monitoring system is widely used, and the topology is referenced in the topology, shape and size, line not related to the relationship.

The network of computers and communication device abstraction as a point, bring transmission media abstract as a line from point and line geometry is computer network topology. Network topologies reflect network entities structure relationship, is building a network of computers, the first step is to implement a variety of network protocols, network performance, system reliability and communication costs have a significant impact. The most basic network topology: topological ring, star line topology, three bus topology.

1. bus topology

Is all of the devices in the network through a corresponding hardware interface directly connected to a public bus, the nexus between the broadcasting communication, a nexus of information, the other nodes on the bus to "tune in" to.

Advantages: the structure is simple, wiring easily, high reliability, easy to expand, often using a LAN topology. Disadvantages: all data is transmitted through bus, bus to become the bottleneck of the whole network; failure diagnosis more difficult. The most famous bus topology is an Ethernet network (Ethernet).

2. it star topology

Each node is identified by a separate communication lines from the Center node link.

Advantages: the structure is simple, easy to implement, simple to manage, the connection point of the fault easily monitoring and troubleshooting. Disadvantages: Center node is the network of reliable bottlenecks, Center node failure can lead to paralysis of the network.

3. ring topology

Each node is composed by closed circuit communication line, ring data can only be a one-way transmission.

Advantages: the structure is simple, Rong to be cable, suitable for the use of fibre, transmission distance, transmission delay. Disadvantages: ring in each node will become the bottleneck of network reliability, arbitrary node failure will cause network paralyzed, and troubleshooting more difficult. The most famous ring topology network is a token ring network (Token Ring)

4. tree topology

Is a kind of hierarchy, the site hierarchically linked to information exchange between the upper and lower joints mainly, adjacent nodes or with the nexus between the General not for data exchange.

Benefits: links is simple, easy maintenance, suitable for pooling information on application requirements. Disadvantages: the low resource-sharing capability, and reliability is not high, any one workstation or link failure will affect the entire run of network.

5. network topology

Also known as irregular structure, links between nodes is arbitrary, not law.

Advantages: high reliability, easy to expand, but the structure of the complex, each node is linked with a number of points, so you must use a routing algorithm and flow control method. Current Wan basically takes a mesh topology.

6. mixed topology

Is two or more simultaneous use of topology.

A: you can draw on the basic topology of the network. Disadvantage: the network configuration of the bag there is difficult.

7. tree topology

Advantages: can achieve broadcast traffic.

Disadvantage: the roots have to too large.

8. radio communication topology

9. satellite communication topology